Please try the following Removal Guide:How to Remove PC Optimizer Pro (Uninstall Guide)
I might suggest before running the (Removal Guide). To run the Latest McAfee Getsusp Tool, so as the detections will be added to the McAfee GTI. Please remember to enter your Email address under "Preferences" before scanning. This and other Superb Free Tools can be obtained from the following Link:Anti-Spyware/Malware & Hijacker Tools
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Here's hoping you have a browser translator add-on. I moved this to the right section.
Perfopt.exe is a type of EXE file associated with Kingsoft PC Doctor and should be removed.
Check your Program list and all browser add-ons to see if there is any evidence of it that you can uninstall.
Check the last link in my signature below and run AdwCleaner and Malwarebytes Free (do NOT accept the free trial to keep it free).
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CD thanks for that link, I missed that.
I might add in addition, just another (Prime) example of what these "Registry Cleaners" can do to your system.
More often than not...Cause system malfunctions.